/**
 * @author 三太子小徐
 * @create 2020-05-22 11:23
 */
public class test {
    public static void main(String[] args) {

//        System.out.println(1 / 0);
//        System.out.println(0.1 / 0);
//        System.out.println(0.0 / 0);
//        System.out.println(0.1 / 0);

//


        StringBuffer str = new StringBuffer("hell");
        System.out.println(str);

        str.append("o");
        System.out.println(str);
        str.append('p');
        System.out.println(str);


    }
}
